Higher DRAM frequency crashes system

[olm]

Hello people,
I have installed Corsair CM2X2048-8500C7 (2048 MB, 1066 MHz, 7-7-7-20) into my Asus P5Q mainboard. The memory runs stable at a frequency of 800 MHz, but at 1066 it causes the system to crash.

My BIOS settings:
FSB frequency: 266
FSB Strap to North Bridge: Auto
DRAM frequency: DDR2-1066
DRAM Timing: Auto

Is this because of any incorrect setting or just because this memory model isn't on the mainboard's qualified vendors list? Is the qualified vendors list something one have to adhere strictly to so that the system will crash otherwise or some kind of guarantee that this or that module will work for sure? Thanks for any help.

 

[EasyLover]

No, there is no issue of compatibility. Run memtest86 on the RAM also provide the reading from CPU-Z of your RAM. If RAM is XMP enabled, try enabling the XMP in the BIOS settings.

Also try updating the BIOS of the mobo and then clear CMOS.

 

[Tradesman1]

DRAM is prob fine, make sure you have the latest BIOS, then may need to add a little voltage to the DRAM or the NB voltage (that's your MC voltage)

 

[olm]

Thanks. I updated the BIOS, but that didn't solve the problem. The OS starts, but after a while I get a bluescreen with this message: " A clock interrupt was not received on a secondary processor".

"Adding a little voltage"? How does this work in practice?

 

[Tradesman1]

A little extra to the DRAM (+ 0.05) and/or the NB can help stabilize the DRAM

 

[olm]

Thanks. Could adding voltage harm the hardware? What does NB mean?

 

[Tradesman1]

NB = NorthBridge, it's the chipset that controls your MC (memory controller), and yes it's safe

 

[olm]

I'm confused, because according to CPU-Z it's DDR2-800 and not DDR2-1066, because DDR2-1066 has a bandwidth of 8,533 MB/s and called PC2-8500. However, the label says it's 1066:

RAM module:

SPD:

Memory running in...

...DDR2-1066 mode:

...DDR2-800 mode:

 

[EasyLover]

Whenever using DDR RAM and CPU-Z. Multiply the DRAM Frequency value shown in CPU-Z with 2 because DDR is Double Data Rate. So 534.5 * 2 = 1069 MHz. 400.9 * 2 = 818 MHz.

CPU-Z reading is correct and RAMs are ok as well.

 

[olm]

That's not the problem, but what I don't understand is that SPD -> Max. Bandwidth says PC2-6400 (400 MHz), which is not correct if the RAM is sold as DDR2-1066 or PC2-8500.

 

[Tradesman1]

What shows in max bandwith is nothing more than the default boot indo from the SPD - it's simply info (and IMO grossly mislabeled by CPU-Z) other oddities of CPU-Z here:

http://www.gskill.us/forum/showthread.php?t=10565

 

[EasyLover]

Ahhh! I see why someone is obsessed with G.Skill! No offense please

 

[Tradesman1]

If talking to me, I'm an Admin at the GSkill Forums, been using their sticks for a long time, went to their forums back in 08 or so with questions on their SSDs, and the folks working support then weren't very knowledgeable so I started helping there, same as I do here, they since have brought in some great techs and provide great support...I still use DRAM from other manufacturers at client requests, but look to GSkill first for DRAM, have favorites in most all the different areas, SeaSonic for PSUs, nVidia cards - Asus or EVGA, AMD cards GB or Asus, mobos - only Asus, the Rock and GB, SSDs - Samsung, cases - HAF series, etc, but it all depends on what a client wants

 

[EasyLover]

Wow! Great! Keep it up please. You are real help for all concerned.

 

[olm]

I added some voltage to DRAM voltage and NB voltage, but the system is still instable. It runs for a while and then crahes with a bluescreen. Does it make a big difference if the RAM runs as DDR2-800 or DDR2-1066? My CPU is an Intel Q6600.

 

[Karadjgne]

according to cupid you have memory in slots 1+3. Asus recommends using dual channel memory in slots 2+4. dunno if that makes a difference, but running the xmp to bump ddr2 800 to stated ddr2 1066, might make a difference.